My overheat light and warning siren came on while fishing at Lake Fork this week. They only came on at idle speeds and would stop as soon as we sped up. I took it to a local shop who installed a new water pump, but that did not solve the problem. I took it to my local authorized Yamaha dealer back home and he found that my exhaust manifold apparently burned up, which as I understand it is causing gases to build up within the engine and may cause additional damage. The technician had never seen this before. This looks to be an expensive repair. Has anyone experienced this? It is the 200 hp VMAX 3.1 2 cycle 2004 engine. I assume I have no choice, but replace the exhaust manifold, but the customer relations guy at Yamaha made it sound like it was not absolutely necessary to replace it.